The invention discloses an ingredient mixing device for mixed flour processing and a use method thereof, and relates to the technical field of flour processing. The device comprises batching barrels, a circular turntable, a mixing barrel and a driving mechanism, wherein the multiple batching barrels which are uniformly distributed along the circumference are arranged at the edge of the circular turntable, a rotating shaft at the bottom of the circular turntable is fixedly connected with an output shaft of a first motor, the first motor is fixed on a supporting table, and the mixing barrel is arranged below the batching barrels; the mixing barrel is fixedly mounted on the driving mechanism; and the driving mechanism is mounted on the supporting table. Through cooperation of an upper electromagnetic valve, a metering cylinder and a lower electromagnetic valve, quantitative adding of ingredients can be achieved, through arrangement of an adjusting sleeve, a mounting plate and a bolt, the volume of the metering cylinder can be freely adjusted, the whole device achieves automatic ingredient mixing, the production efficiency is high, and the problems that an existing ingredient mixing device is low in machining efficiency, automatic production is difficult to realize, and quantitative feeding is difficult to realize are solved.